title: Hydrogen potassium adenosine triphosphatase activity inhibition and downregulation of its expression by bioactive fraction DLBS2411 from Cinnamomum burmannii in gastric parietal cells.
abstract: This study assessed the gastric acid antisecretory effect of DLBS2411 fractionated from Cinnamomum burmannii. Hydrogen potassium adenosine triphosphatase (H(+)/K(+) ATPase) activity and its gene expression were observed, and the antioxidant activity of DLBS2411 was also investigated. Treatment of DLBS2411 decreased the level of H(+)/K(+) ATPase messenger RNA expression on human embryonic kidney 293 cells and rat gastric parietal cells in a dose-dependent manner, in vitro and ex vivo. DLBS2411 also acted as a competitive inhibitor by showing inhibition in gastric H(+)/K(+) ATPase activity at various pHs. In gastric ulcer animal models induced with indomethacin and ethanol, DLBS2411showed a reduction in the number of petechiae, suggesting that the fraction also confers gastroprotective activity. Moreover, DLBS2411 was also found to have potent antioxidant activity. Taken together, DLBS2411 is a promising novel agent for the management of dyspepsia, a condition of hyperacidity and diseases in the stomach requiring gastroprotection.
authors.affiliation: Section of Molecular Pharmacology, Dexa Medica, Cikarang, Indonesia ; Section of Animal Pharmacology, Dexa Medica, Cikarang, Indonesia.
authors.forename: Raymond R
authors.initials: RR
authors.lastname: Tjandrawinata
authors.forename: Florensia
authors.initials: F
authors.lastname: Nailufar
authors.forename: Poppy F
authors.initials: PF
authors.lastname: Arifin
keywords: H+/K+ ATPase; gastroprotective; proton-pump downregulator; proton-pump inhibitor